Current sensor

Abstract

The utility model relates to a current sensor, which comprises a circuit board, an assembly part, an electromagnet, a first shielding part and a second shielding part, and is characterized in that a detection channel is formed in the assembly part; the electromagnet comprises a magnetic core and a coil unit wound outside the magnetic core, and the magnetic core is arranged outside the assembly part in a sleeving manner; the first shielding part is arranged on the assembly part and located on one side of the magnetic core, the second shielding part is arranged on the assembly part and located on the other side of the magnetic core, a gap is formed between the first shielding part and the second shielding part, and the coil unit penetrates through the gap and is electrically connected with the circuit board. Compared with the prior art, the current sensor can prevent an external magnetic field from interfering with the electromagnet, so that the detection accuracy of the current sensor is improved, the coil unit can directly penetrate through the gap between the first shielding piece and the second shielding piece to be electrically connected with the circuit board, the structure is simple, the manufacturing difficulty is low, and the cost is low. And the manufacturing cost of the current sensor is reduced.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to a current sensor. Background Technology

[0002] A current sensor is a device used to detect information such as the magnitude of the current in a conductor. When using a current sensor, the conductor to be tested needs to be placed in the detection area of ​​the current sensor. When current flows through the conductor, a magnetic field is generated around the conductor. Under the influence of the magnetic field, the magnetic flux in the magnetic core of the current sensor will change, causing an induced electromotive force to be generated in the coil wound on the magnetic core. The magnitude of the current flowing through the conductor can be deduced from the induced electromotive force generated in the coil unit, thereby realizing the detection of the magnitude of the current in the conductor.

[0003] To prevent other magnetic fields around the current sensor from interfering with the magnetic core and coil inside the current sensor and causing inaccurate detection results, traditional technology usually requires a complex magnetic field shielding structure inside the current sensor, which is difficult to manufacture and increases the manufacturing cost of the current sensor. Utility Model Content

[0004] Therefore, it is necessary to provide a current sensor that addresses the problem of high manufacturing difficulty of magnetic field shielding structures in traditional technologies, which leads to increased manufacturing costs of current sensors.

[0005] The technical solution is as follows:

[0006] One embodiment provides a current sensor, including:

[0007] Circuit board;

[0008] An assembly, wherein a detection channel is formed inside the assembly;

[0009] An electromagnet, comprising a magnetic core and a coil unit wound around the magnetic core, the magnetic core being fitted over the outside of the assembly; and

[0010] A first shield and a second shield are provided. The first shield is disposed on the assembly and located on one side of the magnetic core, and the second shield is disposed on the assembly and located on the other side of the magnetic core. A gap is formed between the first shield and the second shield, and the coil unit passes through the gap and is electrically connected to the circuit board.

[0011] In the aforementioned current sensor, the first and second shields are respectively disposed on opposite sides of the magnetic core to prevent external magnetic fields located outside the magnetic core from interfering with the electromagnet. A gap exists between the first and second shields, and the coil unit wound on the magnetic core can pass through this gap to achieve electrical connection with the circuit board. The circuit board can supply power and process signals to the coil unit, thereby realizing the detection of the current magnitude in the conductor under test passing through the detection channel. Compared with traditional technology, the aforementioned current sensor can not only prevent external magnetic fields from interfering with the electromagnet, thereby improving the detection accuracy of the current sensor, but also allows the coil unit to directly pass through the gap between the first and second shields to achieve electrical connection with the circuit board. The structure is simple and easy to manufacture, thereby reducing the manufacturing cost of the current sensor.

[0012] In one embodiment, the first shielding member is provided with a first mounting through hole, the second shielding member is provided with a second mounting through hole, and the mounting accessory passes through the first mounting through hole and the second mounting through hole.

[0013] This configuration, by sequentially passing the assembly parts through the first assembly through hole, the magnetic core, and the second assembly through hole, places the magnetic core between the first and second shielding components, thereby achieving shielding against external magnetic fields and preventing external magnetic fields from interfering with the electromagnet from both sides of the magnetic core. The assembly process is simple and the implementation cost is low.

[0014] In one embodiment, the current sensor further includes a housing with a mounting groove. The bottom wall of the mounting groove has a detection through hole. The assembly is disposed in the mounting groove. One end of the detection channel communicates with the detection through hole, and the other end of the detection channel faces outward from the mounting groove. The side wall of the mounting groove, the bottom wall of the mounting groove, and the outer wall of the assembly surround to form an installation space. The circuit board, the electromagnet, the first shield, and the second shield are all disposed within the installation space.

[0015] The conductor under test can enter one end of the detection channel through the detection through hole and exit from the other end of the detection channel to realize the detection of the current of the conductor under test; the installation space can not only accommodate the circuit board, electromagnet, first shield and second shield, making the overall structure of the current sensor more compact, but also prevent other components from bumping and damaging the circuit board, electromagnet, first shield and second shield.

[0016] In one embodiment, the current sensor further includes an electrical connector comprising a mounting housing and a pin. The mounting housing has a communicating cavity and a connection port. One end of the pin is electrically connected to the circuit board, and the other end of the pin passes through the mounting housing and is located within the cavity. The end of the pin away from the circuit board is positioned towards the connection port.

[0017] The circuit board is electrically connected to external terminals via pins to output the measurement results of the current sensor on the test piece to an external device. In addition, the external device can also supply power to the circuit board via pins. The mounting housing can protect the pins inside the cavity, preventing damage to the pins from affecting the output of test results and the power supply to the circuit board.

[0018] In one embodiment, the mounting space is provided with a sealant, the circuit board, the electromagnet, the first shield and the second shield are all embedded in the sealant, the mounting shell protrudes from the sealant, and the connection port is opened opposite to the sealant.

[0019] The encapsulant can fix the circuit board, electromagnet, first shield and second shield in the installation space. The mounting shell protrudes from the encapsulant and the connection port faces away from the encapsulant to realize the electrical connection between the circuit board inside the encapsulant and the external device.

[0020] In one embodiment, the current sensor further includes a fixing component disposed in the housing and located outside the mounting slot, the fixing component being used for connection to an external component.

[0021] The housing is connected to the external component via a fixing assembly to secure the current sensor to the external component.

[0022] In one embodiment, the fixing component includes an ear base and a fixing member, the ear base having a fixing hole, and the fixing member being used to pass through the fixing hole and connect to the external component.

[0023] The fastener passes through the mounting hole on the earpiece and connects to the external component to fix the earpiece to the external component, thereby fixing the current sensor as a whole to the external component.

[0024] In one embodiment, at least two ear seats and one corresponding fastener are provided.

[0025] At least two ear mounts and at least two fasteners can improve the fixing strength between the housing and the external components, preventing the current sensor from falling off the external components and causing damage.

[0026] In one embodiment, the sidewall of the mounting groove is provided with a boss, which is positioned facing the electromagnet.

[0027] The side wall of the mounting slot is provided with a boss facing the electromagnet. This allows the overall shape of the mounting space to better match the overall shape of the electromagnet, reducing the amplitude of the electromagnet's vibration within the mounting space and preventing damage to the electromagnet due to excessive vibration.

[0028] In one embodiment, the coil unit includes an excitation coil and a feedback coil. One end of the excitation coil is electrically connected to a first electrical connection portion of the circuit board, and the other end of the excitation coil is electrically connected to a second electrical connection portion of the circuit board. One end of the feedback coil is electrically connected to a third electrical connection portion of the circuit board, and the other end of the feedback coil is electrically connected to a fourth electrical connection portion of the circuit board.

[0029] The circuit board outputs alternating current to the excitation coil through the first and second electrical connections, causing a change in the magnetic flux within the magnetic core. This, in turn, induces an electromotive force in the feedback coil. When the current through the conductor under test in the detection channel is zero, the third and fourth electrical connections of the circuit board supply feedback current to the feedback coil, keeping the magnetic flux within the magnetic core zero. At this time, the average current flowing through the feedback coil is zero. When the current through the conductor under test in the detection channel is not zero, a magnetic field is generated around the conductor under test. This generates an additional magnetic field within the magnetic core, causing the magnetic flux within the core to be non-zero. To keep the magnetic flux within the core zero, additional current needs to be supplied to the feedback coil through the third and fourth electrical connections. At this time, the average feedback current flowing through the feedback coil is not zero. The circuit board calculates the average feedback current accordingly to obtain the current of the conductor under test. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is an exploded view of a current sensor in one embodiment of this application.

[0032] Figure 2 This is another exploded view of the current sensor in one embodiment of this application.

[0033] Figure 3 This is a schematic diagram of the assembly of a current sensor in one embodiment of this application.

[0034] Figure 4 This is a schematic diagram of an embodiment of the present application showing an electromagnet located within an installation space.

[0035] Figure 5 This is a schematic diagram of the structure of the electromagnet, circuit board, and electrical connector in one embodiment of this application.

[0036] Figure 6 This is a schematic diagram of the front structure of a current sensor in one embodiment of this application.

[0037] Figure 7 This is a schematic diagram of the back structure of the current sensor in one embodiment of this application.

[0038] Attached image annotations:

[0039] 100, Circuit board; 110, First electrical connection; 120, Second electrical connection; 130, Third electrical connection; 140, Fourth electrical connection; 200, Assembly; 210, Detection channel; 300, Electromagnet; 310, Magnetic core; 320, Coil unit; 321, Excitation coil; 322, Feedback coil; 410, First shield; 411, First mounting through hole; 420, Second shield; 421, Second mounting through hole; 430, Gap; 500, Housing; 510, Mounting slot; 511, Boss; 520, Detection through hole; 530, Mounting space; 600, Electrical connector; 610, Mounting shell; 611, Cavity; 612, Connection port; 620, Pin; 700, Sealing compound; 800, Fixing assembly; 810, Ear mount; 811, Fixing hole. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0046] Please see Figures 1 to 5One embodiment of this application provides a current sensor, including a circuit board 100, an assembly 200, an electromagnet 300, a first shield 410, and a second shield 420. A detection channel 210 is formed inside the assembly 200. The electromagnet 300 includes a magnetic core 310 and a coil unit 320 wound around the outside of the magnetic core 310. The magnetic core 310 is sleeved on the outside of the assembly 200. The first shield 410 is disposed on the assembly 200 and located on one side of the magnetic core 310, and the second shield 420 is disposed on the assembly 200 and located on the other side of the magnetic core 310. A gap 430 is formed between the first shield 410 and the second shield 420. The coil unit 320 passes through the gap 430 and is electrically connected to the circuit board 100.

[0047] In the aforementioned current sensor, the first shield 410 and the second shield 420 are respectively disposed on opposite sides of the magnetic core 310 to prevent external magnetic fields located outside the magnetic core 310 from interfering with the electromagnet 300. A gap 430 exists between the first shield 410 and the second shield 420, and the coil unit 320 wound on the magnetic core 310 can pass through the gap 430 to achieve electrical connection with the circuit board 100. The circuit board 100 can supply power and process signals to the coil unit 320, thereby realizing the detection of the current magnitude in the conductor to be measured passing through the detection channel 210. Compared with the conventional technology, the aforementioned current sensor can not only prevent external magnetic fields from interfering with the electromagnet 300, thereby improving the detection accuracy of the current sensor, but also allows the coil unit 320 to directly pass through the gap 430 between the first shield 410 and the second shield 420 to achieve electrical connection with the circuit board 100. The structure is simple and the manufacturing difficulty is low, thereby reducing the manufacturing cost of the current sensor.

[0048] To explain, when a conductor under test (such as a wire) carrying alternating current is passed into the detection channel 210 inside the assembly 200, the magnetic core 310 fitted on the assembly 200 generates a changing magnetic field, causing the coil unit 320 to generate an induced electromotive force. The circuit board 100 can deduce the magnitude of the alternating current on the conductor under test from the induced electromotive force generated on the coil unit 320.

[0049] In one embodiment, the assembly 200 includes an assembly tube, a detection channel 210 connecting the opposite ends of the assembly tube, and a first shield 410, a magnetic core 310, and a second shield 420 arranged sequentially along the axial direction of the assembly tube.

[0050] Optionally, the first shield 410 and the second shield 420 can be disposed at opposite ends of the assembly tube, or can be sleeved outside the assembly tube, as long as the first shield 410 and the second shield 420 are located on both sides of the magnetic core 310 respectively. No specific limitation is made here on the assembly method of the first shield 410 and the second shield 420.

[0051] Please see Figure 4 and Figure 5 In another feasible embodiment, the coil unit 320 includes an excitation coil 321 and a feedback coil 322. One end of the excitation coil 321 is electrically connected to a first electrical connection portion 110 of the circuit board 100, and the other end of the excitation coil 321 is electrically connected to a second electrical connection portion 120 of the circuit board 100. One end of the feedback coil 322 is electrically connected to a third electrical connection portion 130 of the circuit board 100, and the other end of the feedback coil 322 is electrically connected to a fourth electrical connection portion 140 of the circuit board 100.

[0052] The current sensor is a fluxgate current sensor based on the fluxgate principle. Circuit board 100 outputs alternating current to excitation coil 321 via first electrical connection 110 and second electrical connection 120, causing a change in the magnetic flux within magnetic core 310. This, in turn, induces an electromotive force in feedback coil 322. When the current in the conductor being measured flowing through detection channel 210 is zero, third electrical connection 130 and fourth electrical connection 140 of circuit board 100 supply feedback current to feedback coil 322, keeping the magnetic flux within magnetic core 310 zero. At this time, feedback coil 322... When the average current flowing through the test conductor is zero, a magnetic field is generated around the test conductor when the current flowing through the test channel 210 is not zero. At this time, an additional magnetic field is generated in the magnetic core 310, causing the magnetic flux of the magnetic core 310 to be non-zero. In order to keep the magnetic flux in the magnetic core 310 zero, an additional current needs to be flowed through the third electrical connection 130 and the fourth electrical connection 140 to the feedback coil 322. At this time, the average feedback current flowing through the feedback coil 322 is not zero. The circuit board 100 calculates the average feedback current accordingly to obtain the current of the test conductor.

[0053] In other embodiments, there may be only one coil unit 320 wound around the magnetic core 310, and the current sensor may be a Hall current sensor or a current transformer. The working principle can be referred to the Hall current sensor or current transformer in the prior art, and will not be described in detail here.

[0054] Furthermore, the first electrical connection portion 110 and the second electrical connection portion 120 are electrically connected through a first circuit on the circuit board 100, and the third electrical connection portion 130 and the fourth electrical connection portion 140 are electrically connected through a second circuit on the circuit board 100.

[0055] Furthermore, the first shield 410, the magnetic core 310, and the second shield 420 are stacked along the axial direction of the assembly tube to form a gap 430 between the first shield 410 and the second shield 420. The coil unit 320 passes through the gap 430 and is connected to the circuit board 100. The circuit board 100 can not only acquire the induced electromotive force generated by the coil unit 320, but also supply power to the coil unit 320 in some application scenarios, so that the current sensor can simultaneously detect DC current and alternating current.

[0056] As a further explanation, in conventional technology, the magnetic field shielding structure of a current sensor needs to completely enclose the magnetic core 310. This not only complicates the assembly process but also requires openings in the magnetic field shielding structure to lead out the coil wound on the magnetic core 310, further increasing manufacturing costs. In this embodiment, while the interference from the external magnetic field is shielded by the first shielding member 410 and the second shielding member 420 located on opposite sides of the magnetic core 310, the coil unit 320 can also be smoothly led out from the gap 430 between the first shielding member 410 and the second shielding member 420 and electrically connected to the circuit board 100 without the need for additional openings or other processes, resulting in lower manufacturing costs.

[0057] In one embodiment, the first shield 410 includes a first silicon steel sheet, and the second shield 420 includes a second silicon steel sheet. When the current sensor is installed, the plane on which the first silicon steel sheet or the plane on which the second silicon steel sheet is located is perpendicular to the ground. Since the direction of the Earth's magnetic field is parallel to the ground, this arrangement makes the Earth's magnetic field perpendicular to the first and second silicon steel sheets. Therefore, in the direction of the Earth's magnetic field, the first and second silicon steel sheets are located on both sides of the electromagnet 300, thereby preventing the Earth's magnetic field from interfering with the electromagnet 300.

[0058] Furthermore, in this embodiment, the current sensor is mainly used in a DC power supply panel. Multiple current sensors are installed inside the cabinet of the DC power supply panel. For the current sensors inside the cabinet, the interference from the external magnetic field mainly comes from the Earth's magnetic field. In this embodiment, the first silicon steel sheet and the second silicon steel sheet are spaced apart in the direction of the Earth's magnetic field to shield the Earth's magnetic field.

[0059] Furthermore, the first and second silicon steel sheets are high-silicon-content silicon steel sheets. The magnetic field shielding effect of silicon steel sheets is related to their silicon content. Therefore, high-silicon-content silicon steel sheets have a better magnetic shielding effect to prevent external magnetic fields from interfering with the electromagnet 300.

[0060] Please see Figure 2 and Figure 3In one embodiment, the first shield 410 is provided with a first mounting through hole 411, the second shield 420 is provided with a second mounting through hole 421, and the mounting accessory 200 passes through the first mounting through hole 411 and the second mounting through hole 421.

[0061] With this configuration, by passing the assembly 200 sequentially through the first assembly through hole 411, the magnetic core 310, and the second assembly through hole 421, the magnetic core 310 is positioned between the first shield 410 and the second shield 420, thereby achieving shielding against external magnetic fields and preventing external magnetic fields from interfering with the electromagnet 300 from both sides of the magnetic core 310. The assembly process is simple and the implementation cost is low.

[0062] Furthermore, the first shield 410, the second shield 420, and the magnetic core 310 are all annular, and the diameters of the first assembly through hole 411 and the second assembly through hole 421 are approximately equal to the diameter of the assembly tube. Thus, when the assembly tube passes through the first assembly through hole 411 and the second assembly through hole 421, it can also play a certain limiting role for the first shield 410 and the second shield 420.

[0063] Please see Figures 1 to 4 In one embodiment, the current sensor further includes a housing 500, which has a mounting groove 510. The bottom wall of the mounting groove 510 forms a detection through hole 520. The fitting 200 is disposed in the mounting groove 510. One end of the detection channel 210 communicates with the detection through hole 520, and the other end of the detection channel 210 faces outward from the mounting groove 510. The side wall of the mounting groove 510, the bottom wall of the mounting groove 510, and the outer wall of the fitting 200 surround to form a mounting space 530. The circuit board 100, the electromagnet 300, the first shield 410, and the second shield 420 are all disposed in the mounting space 530.

[0064] The conductor under test can enter one end of the detection channel 210 through the detection through hole 520 and exit from the other end of the detection channel 210 to realize the detection of the current of the conductor under test; the installation space 530 can not only accommodate the circuit board 100, electromagnet 300, first shield 410 and second shield 420, making the overall structure of the current sensor more compact, but also prevent other components from bumping and damaging the circuit board 100, electromagnet 300, first shield 410 and second shield 420.

[0065] Furthermore, the detection through hole 520 is located in the middle of the bottom wall of the mounting groove 510, so that the side wall, bottom wall and outer wall of the mounting groove 510 and the assembly 200 form an annular mounting space 530. The annular mounting space 530 can accommodate the annular first shield 410, second shield 420 and magnetic core 310, and can also make room in the middle of the mounting groove 510 for the conductor to be tested to pass through, making the overall structure of the current sensor more compact and reasonable.

[0066] Please see Figures 2 to 4 When assembling the current sensor, the second shield 420 is first fitted onto the assembly 200 through the second assembly through hole 421, then the electromagnet 300 is fitted onto the assembly 200, and finally the first shield 410 is fitted onto the assembly 200 through the first assembly through hole 411. The coil unit 320 is led out through the gap 430 between the first shield 410 and the second shield 420 and electrically connected to the circuit board 100 set in the mounting space 530 to achieve assembly.

[0067] Please see Figures 1 to 6 In one embodiment, the current sensor further includes an electrical connector 600, which includes a mounting housing 610 and a pin 620. The mounting housing 610 has a communicating cavity 611 and a connection port 612. One end of the pin 620 is electrically connected to the circuit board 100, and the other end of the pin 620 passes through the mounting housing 610 and is located in the cavity 611. The end of the pin 620 away from the circuit board 100 is positioned towards the connection port 612.

[0068] The circuit board 100 is electrically connected to an external terminal via pin 620 to output the measurement results of the current sensor on the test piece to an external device. In addition, the external device can also supply power to the circuit board 100 via pin 620. The mounting housing 610 can protect the pin 620 inside the cavity 611 to prevent damage to the pin 620 from affecting the output of the test results and the power supply to the circuit board 100.

[0069] Furthermore, at least two pins 620 are provided and spaced apart along the length of the mounting housing 610 to meet the different functional needs of the circuit board 100.

[0070] In one embodiment, the end of pin 620 away from the circuit board 100 is electrically connected to an external female terminal. The shape of the cavity 611 of the mounting housing 610 matches the shape of the external female terminal. In this way, the external female terminal can enter the cavity 611 that matches its own shape through the connection port 612 and then be electrically connected to pin 620, making the connection more reliable.

[0071] In one embodiment, one end of pin 620 is connected to circuit board 100 by soldering.

[0072] Please see Figure 6 In one embodiment, a sealing body 700 is provided in the installation space 530. The circuit board 100, electromagnet 300, first shield 410 and second shield 420 are all embedded in the sealing body 700. The mounting shell 610 protrudes from the sealing body 700 and the connection port 612 is opened facing away from the sealing body 700.

[0073] The encapsulant 700 can fix the circuit board 100, electromagnet 300, first shield 410 and second shield 420 in the mounting space 530. The mounting shell 610 protrudes from the encapsulant 700 and the connection port 612 faces away from the encapsulant 700, so as to realize the electrical connection between the circuit board 100 inside the encapsulant 700 and the external device.

[0074] Optionally, the mounting housing 610 may be completely protruding from the sealant body 700, or it may be partially embedded in the sealant body 700 and partially protruding from the sealant body 700. The choice can be made flexibly according to the needs of use and assembly, which will not be elaborated here.

[0075] Furthermore, after the staff first installs the circuit board 100, electromagnet 300, first shield 410 and second shield 420 in the installation space 530, they then pour sealant 700 into the installation space to fix the components in the installation space 530.

[0076] Please see Figures 1 to 4 In one embodiment, the current sensor further includes a fixing component 800, which is disposed in the housing 500 and located outside the mounting slot 510, and is used to connect to an external component.

[0077] The housing 500 is connected to an external component via a fixing assembly 800 to secure the current sensor to the external component.

[0078] For example, the external component here can be the cabinet of the DC power supply panel, and the current sensor can be fixed to the cabinet of the DC power supply panel by the fixing component 800.

[0079] In some embodiments, the fixing component 800 may be a fixing seat, a fixing protrusion, or other structures. The connection method between the fixing component 800 and the external component may be threaded connection, bonding, welding, etc., which are not specifically limited here.

[0080] Please see Figure 4 In one embodiment, the fixing component 800 includes an ear seat 810 and a fixing member. The ear seat 810 has a fixing hole 811, and the fixing member is used to pass through the fixing hole 811 and connect to an external component.

[0081] The fastener passes through the fixing hole 811 on the ear seat 810 and connects to the external component to fix the ear seat 810 to the external component, thereby fixing the current sensor as a whole to the external component.

[0082] In one embodiment, the fastener includes a fixing bolt, and the external component is provided with a screw hole corresponding to the fixing bolt. The fixing bolt can pass through the fixing hole 811 on the ear seat 810 and be screwed into the screw hole to fix the ear seat 810.

[0083] Please see Figure 4 In one embodiment, both the ear seat 810 and the fastener are provided in at least two and are arranged in a one-to-one correspondence.

[0084] At least two ear mounts 810 and at least two fasteners can improve the fixing strength between the housing 500 and the external component, and prevent the current sensor from falling off the external component and causing damage.

[0085] exist Figure 4 In the embodiment shown, there are two ear seats 810, which are respectively disposed on both sides of the housing. The two ear seats 810 are staggered along the width direction of the housing to further improve the fixing strength and stability between the ear seats 810 and the external components.

[0086] Please see Figure 3 In one embodiment, the sidewall of the mounting groove 510 is provided with a boss 511, which is positioned facing the electromagnet 300.

[0087] The side wall of the mounting slot 510 is provided with a boss 511 facing the electromagnet 300. This makes the overall shape of the mounting space 530 more compatible with the overall shape of the electromagnet 300. While reducing the assembly difficulty, it can also reduce the amplitude of the electromagnet 300 when it vibrates in the mounting space 530, and prevent the electromagnet 300 from being damaged due to excessive vibration.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A current sensor, characterized by The current sensor comprises a circuit board, an assembly, an electromagnet, a first shield and a second shield. The assembly is internally formed with a detection channel. The electromagnet comprises a magnetic core and a coil unit wound outside the magnetic core, and the magnetic core is sleeved outside the assembly. The first shield is arranged on one side of the magnetic core, and the second shield is arranged on the other side of the magnetic core. The first shield and the second shield form a gap therebetween, and the coil unit is arranged in the gap and electrically connected with the circuit board.

2. The current sensor of claim 1, wherein, The first shield is provided with a first assembly through hole, and the second shield is provided with a second assembly through hole.

3. The current sensor of claim 1, wherein, The assembly is arranged in the first assembly through hole and the second assembly through hole.

4. The current sensor of claim 3, wherein, The current sensor further comprises a housing provided with a mounting groove.

5. The current sensor of claim 4, wherein, The bottom wall of the mounting groove is formed with a detection through hole.

6. The current sensor of claim 3, wherein, The assembly is arranged in the mounting groove.

7. The current sensor of claim 6, wherein, One end of the detection channel is communicated with the detection through hole, and the other end of the detection channel is directed out of the mounting groove.

8. The current sensor of claim 7, wherein, The side wall of the mounting groove, the bottom wall of the mounting groove and the outer wall of the assembly form a mounting space.

9. The current sensor of claim 3, wherein, The circuit board, the electromagnet, the first shield and the second shield are arranged in the mounting space.

10. The current sensor of claim 1, wherein, The current sensor further comprises an electrical connector comprising a mounting shell and a pin. One end of the pin is electrically connected with the circuit board. The other end of the pin is arranged in the mounting shell and located in the cavity. The other end of the pin is directed to the connecting port. The mounting space is provided with an encapsulation body. The circuit board, the electromagnet, the first shield and the second shield are embedded in the encapsulation body. The mounting shell is arranged protruding from the encapsulation body. The connecting port is arranged away from the encapsulation body. The current sensor further comprises a fixing assembly arranged outside the mounting groove of the housing. The fixing assembly is used to connect with an external component. The fixing assembly comprises an ear seat and a fixing member. The ear seat is provided with a fixing hole. The fixing member is arranged in the fixing hole and connected with the external component. The ear seat and the fixing member are each provided with at least two and are arranged one by one in correspondence. The side wall of the mounting groove is provided with a boss directed to the electromagnet. The coil unit comprises an excitation coil and a feedback coil. One end of the excitation coil is electrically connected with a first electrical connection part of the circuit board. The other end of the excitation coil is electrically connected with a second electrical connection part of the circuit board. One end of the feedback coil is electrically connected with a third electrical connection part of the circuit board. The other end of the feedback coil is electrically connected with a fourth electrical connection part of the circuit board.

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